Pragmatic approach to the little hierarchy problem: the case for Dark Matter and neutrino physics

TL;DR

This paper proposes adding real scalar singlets to the Standard Model to address the little hierarchy problem, provide Dark Matter candidates, and achieve realistic neutrino physics, with specific mass and coupling constraints.

Contribution

It introduces a pragmatic approach by extending the Standard Model with scalars that simultaneously tackle multiple fundamental issues.

Findings

Scalar singlets can alleviate the little hierarchy problem.

The model yields viable Dark Matter candidates.

Neutrino masses and mixings are consistent with experimental data.

Abstract

We show that the addition of real scalars (gauge singlets) to the Standard Model can both ameliorate the little hierarchy problem and provide realistic Dark Matter candidates. To this end, the coupling of the new scalars to the standard Higgs boson must be relatively strong and their mass should be in the 1-3 TeV range, while the lowest cutoff of the (unspecified) UV completion must be >~ 5 TeV, depending on the Higgs boson mass and the number of singlets present. The existence of the singlets also leads to realistic and surprisingly reach neutrino physics. The resulting light neutrino mass spectrum and mixing angles are consistent with the constraints from the neutrino oscillations.